This counter records messages received from an upper-layer protocol (ULP) whose included IP header indicates a message size larger than the message's actual size. An administrator treats a rising count as the mirror-image size inconsistency to cntllc1OutMismIpSizes, again pointing at the ULP's IP header size field rather than this LLC1 instance itself. For example, distinguishing which of these two mismatch counters is rising helps the admin tell whether the ULP's size field is consistently over- or under-reporting message length.